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首页> 外文期刊>International Journal of Heat and Mass Transfer >Analysis of two-phase pressure drop fluctuations during micro-channel flow boiling
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Analysis of two-phase pressure drop fluctuations during micro-channel flow boiling

机译：微通道流沸腾过程中两相压降波动分析

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摘要

Two-phase pressure drop fluctuations during flow boiling in single micro-channel were experimentally investigated. Degassed FC-72 was tested in micro-channels with a hydraulic diameters of 571 μm, 762 μm and 1454 μm (the aspect ratio (W_(in)/d_(in)) is 20,20 and 10) at liquid mass fluxes of 11.2 kg m~(-2) s~(-1), 22.4 kg m~(-2) s~(-1) and 44.8 kg m~(-2) s~(-1) and heat fluxes of 0-18.31 kW m~(-2). Flow instabilities were analysed based on the two-phase pressure drop, synchronous visualisation results and thermographic measurements of the channel surface temperature profiles. Low-frequency high-amplitude fluctuation and high-frequency low-amplitude fluctuation are identified, the main causes of which were found to be the periodic reverse and rewetting flow and the vapour slug cluster passage respectively. The analysis based on a non-dimensional parameter K_1 helps to better understand the dominant influence on the liquid-vapour interface movement during flow boiling. Effects of heat flux, mass flux and channel hydraulic diameter on the pressure drop fluctuation were discussed. Besides, the coefficient of variation of the pressure drop was calculated to further explore the impact of experimental conditions on the flow boiling instabilities in the high aspect ratio micro-channels.
机译：实验研究了在单个微通道中沸腾过程中的两相压降波动。对脱气后的FC-72进行了微通道测试，液体直径为571μm，762μm和1454μm（长径比（W_（in）/ d_（in））为20,20和10）。 11.2 kg m〜（-2）s〜（-1），22.4 kg m〜（-2）s〜（-1）和44.8 kg m〜（-2）s〜（-1），热通量为0- 18.31 kW m〜（-2）。基于两相压降，同步可视化结果和通道表面温度曲线的热成像测量结果，分析了流量不稳定性。确定了低频高振幅波动和高频低振幅波动，其主要原因分别是周期性的逆向流动和再润湿流动以及气团团簇通过。基于无量纲参数K_1的分析有助于更好地了解流沸腾过程中对液-气界面运动的主要影响。讨论了热通量，质量通量和通道水力直径对压降波动的影响。此外，计算了压降的变化系数，以进一步探索实验条件对高长宽比微通道中流沸腾不稳定性的影响。

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  • 作者

    Yuan Wang; Khellil Sefiane; Zhen-guo Wang; Souad Harmand;

  • 作者单位

    Science and Technology on Scramjet laboratory, National University of Defense Technology, Changsha, Hunan 410073, People's Republic of China;

    School of Engineering, University of Edinburgh, The King's Buildings, Mayfield Road, Edinburgh EH9 3JL, UK;

    Science and Technology on Scramjet laboratory, National University of Defense Technology, Changsha, Hunan 410073, People's Republic of China;

    UVHC, TEMPO, Universite Valenciennes, F-59313, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Flow boiling; Instability; Pressure drop fluctuation; Micro-channel;

    机译：流沸腾;不稳定;压降波动;微信;

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